单项选择题
On a semisubmersible ship，reserve buoyancy is increased by the presence of void spaces above the waterline in the（）.
A.submerged hulls B.quarters C.columns and upper structure D.submerged connecting structures
单项选择题 My drafts are 28 feet（）and 29 feet aft.
单项选择题 Keeping the draft at or below the load line mark will insure that the vessel has adequate（）.
单项选择题 It’ll affect neither the draft（）the rotation of discharging.
